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D( z )
12*z^7 = 0
12*z^7 = 0
12*z^7 = 0
12*z^7 = 0 // : 12
z^7 = 0
z = 0
z in (-oo:0) U (0:+oo)
(36*z^3)/(12*z^7) = 0
3*z^-4 = 0 // : 3
z^-4 = 0
z należy do O
z belongs to the empty set
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